Compression Ratio Question

I just had the head off my d15 milled 26 thousandths. My friend that did it for me said that I'd have to run 92 octane gas now becuz of the raised compression. I was curious, does anyone know how much this does raise the compression?

Oh... is there a difference between cams or in the heads at all between teh d15 and d16? is there a difference in the block?

I've been thinking about a MPFI conversion... but If there is a difference besides the intake then I might just save my money and go even bigger for the ZC. Becuz the head I have is milled and port and polished now.

d16 came in Si, and they had a slightly more aggressive cam. The head itself it the same I believe, I know they are interchangeable. Stay away from ZC, there chunks of japanese shit (thats why they send them all over here). If your looking for a stuff for a mpfi swap I have everything you need except ecu and dizzy listed in classifieds.

If I do the mpfi conversion I think I wanna get the Venom intake manifold. Are there any bigger bore throttle bodies available for mpfi?

Becuz the head I have is milled and port and polished now.

Who ported and polished it and how much did it cost?

I friend of mine and his dad did the work. His dad owns a machine shop. He did it for free tho, he said it would have been like $400. He did a 3 angle valve job too. The whole shibbang!

I dont know of any larger bore throttle bodies that arnt made for mpfi

but are there some that are for mpfi?

why do you think the ZC's are trash, they are actually very good motors especially for such a cheap price.

yeah there are several companies that make larger throttle bodys, but you can usually find a 64mm used ITR cheeper than what an aftermarket one will be and it is the perfect size.

lets see... There neer impossable to find parts for and when you do there expensive as shit, lack of aftermarket parts, not very reliable, and arnt that great performers.

but does anyone know how to figure the new compression ratio?

they can perform just as easily as SOHC VTEC can, as far as relieble, i cant say, my boys ZC has been working fine for years, yea they are a little light on the aftermarket support, but if you know what the parts interchange is for em, then you neednt worry bout it.

sorry man I couldnt tell you how to figure the compressoin, try asking you friends dad who owns the machine shop, it wont be more than a point or so though.

I dont personally own a ZC but there a really really common subject on the forums and the common themes are reliablity and trying to find parts.

ZC is GARBAGE! I already know 5 ppl that blown on them. We installed one in a crx dx and 2 weeks later and it blow up.

ZC is GARBAGE! I already know 5 ppl that blown on them. We installed one in a crx dx and 2 weeks later and it blow up.

omG Geebuz!! D16A6 PWNAGEALICIOUS!

Yes i've heard a lot of ZC horror stories, at that risingsun engines site, they charge more for my d16a6 than they do for the zc, go figure

Hey his cams split in half! :eek:

: o

holeh

I wouldnt go calling ZC's trash right away. Almost all of the people who have blown them do it because of this reason simple: The PG7 ecu rev limit is 7500rpms! The PM7 which is the ecu for the DOHC ZC's has a rev limit of 7200. Most people forget that and go redlining their ZC's to 7500 then it blows up and their like what the fuck. Also it depends on who your getting it from. The company I got mine from hot runs them unlike most places, meaning the start the motor up and run it. Other places only compression check em and leak down. Also it depends on the driver and how you take care of it. Most fucks just beat the shit out of em. Of course if you beat a motor it's gonna go bad. As for finding parts. Not a problem. 89 Integra is your answer to the bottom half and head. 91 crx to the rest and 88 prelude for the timing belt. As for aftermarket support, check www.dh-racing.com. Just my 2 cents.

BTW, I would recommend RisingSun Engines over any company. I have gotten a used transmission and a used DOHC ZC from them and I can't complain at all.

I beat the shit out of my b16a, poor mans type r and nothing happen. ZC isn't reliable. My boys do know how to drive thank you.

try this for your compression ratio:

http://jniolon.clubfte.com/compressionratio.html

can anyone tell me what the combustion chamber volume is for my head???! and deck height?

Mellow It all depends on the motors, How they are put in so on. I know of Two People who Blew up 5 motors this summer.

one guy blew up 3 B18C and 2 B16a
the other guy Blew up 2 B20's 2 LS's and a B16.

so using your analogy the B18C, B16, B20, B18A are garbage because they blow up.

and when I say blow up, they Split sleves, pistons shattered, Rods broke, and once it spun a Brand new bearing.

the truth of the matter is there are many different variables involves with the motors. I had a DOHC ZC and liked it quite a bit. I just swaped in favour of a b16 for a stronger transmission.

One of my boys has a Fully built ZC that is quite quick and will give most B16 a run for there money, aftermaket support is there now you just need to know where.

K

Yeh its all true but i've hardly heard any horror stories about b and d series motors goin out like that. All five of my boys are very good at doin swaps. We did everything right. Some how it just all fucked up on us. I mean the cams broke in half, gaskets blew...it was just a mess. You're also right about the motors condition. But come on 5 out of 5 times? Its just enough for us to be convinced to stay away from ZC motors for good. I'd choose the sohc vtec over ZC anyday.

B16a trannies are garbage! They always have a problem with third gear ;)

can anyone tell me what the combustion chamber volume is for my head???! and deck height?

Okay, I may be completely full of shit on this one. So someone please correct me if I'm wrong....BUT

According to helms, the service limit for warpage on D16s is 2 thousands for heads and 4 thousandths for the block. Your "friend" milled off 26!!!

If I were you I'd be more worried about valve to piston clearance than what kind of gas to put in it.

haha... I am worried about that... but if it gets F'ed up... He gets to buy me a new engine! :D

yet another reason for D16A6 SOHC PWNAGE!

Ok... I'm all sorts of confused now....

Do the D15 and D16 have different heads? if not... how is the D16 a 1.6L?
Do they have different blocks? and it IS possible to just put MPFI on the D15 head right? and if I wanted to put the cam from a D16 in there... Would it be easier just to switch to the D16 head?

and some of you guys crushed my dreams of riding the DOHC train... lol... I really wish I had the money to throw together a Ls/Vtec... DROOL! But I'm still considering sticking with the D-Series and turbo'ing... or maybe even NOS... but I don't like Nos... everyone has Nos.... Turbo's sound so much sexier....

But anyway.... I'm sure I'll come up with more questions... But if anyone could answer those for me... that'd be great.

Nobody knows?